fix problem caused by confusing immutability OUString semantics again
fix problem caused by confusing immutability OUString semantics again

Change-Id: I9207ec3309b9970afd5c56718829836eead4592b

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core